Daily TAKS Connection: Physical and Chemical Changes IPC(8) The student knows that changes in matter affect everyday life. The student is expected to: (A) Distinguish between physical and chemical changes in matter such as oxidation, digestion, changes in states, and stages in the rock cycle.

Day 1: Construct a two tab foldable Materials Sheet of paper scissors Instructions: Hamburger fold the handout along center fold line Cut along dashed line from edge to center fold Color “Physical Changes” flap Color “Chemical Changes” flap a second color

Day 2: Notes Record the following notes under the “Physical Changes” flap Identity of material DOES NOT change Ex: when you crush ice, the resulting material is still ice Includes: changes in state (evaporation, condensation, melting, boiling, freezing) More words to look for:

Day 2: Notes - ID the word(s) indicating a physical change is taking place in each of the following phrases. Record the words under the physical changes flap after “more words to look for”. spoonful of sugar is dissolved in a cup of coffee. lead melting copper wire is cut into smaller pieces. water molecule gains enough energy to enter the vapor phase antifreeze is added to a car radiator to lower the freezing point moon rocks being converted to lunar soil by sedimentation subduction of plates heat loss from lava compression of sediments evaporation of water from the surfaces of leaves condensation of water on dust particles in the air forming clouds and fog ice cracking Subduction Heat loss Compression Evaporation Condensation Cracking Dissolved Melting Cut Enter vapor phase Lower freezing point sedimentation

Question (hint: look for the words indicating type of change) In the rock cycle, which of these is a physical change involved with the formation of igneous rocks? a. Compression of sediments b. Subduction of plates c. Heat loss from lava d. All of the above Answer: D

Question (hint: look for the words indicating type of change) Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change? Chemical change Nuclear change Physical change Atomic change Answer: C

Question (hint: look for the words indicating type of change) Compounds with the same chemical composition may have different densities because they — a. have differences in reactivity b. vary in solubility c. are able to bond with oxygen d. exist in different phases Answer: D; solids most dense, gases least dense (exception: Water – less dense as a solid; that’s why ice floats). This is a very important concept when evaluating aquatic and marine ecosystems. What would happen to aquatic or marine life if ice sank rather than floated?

Day 3: Notes Record the following notes under the “Chemical Changes” flap Identity of material DOES change Ex: oxygen combines with iron to form iron oxide (rust) Includes all chemical changes Words to look for: Souring, rotting, decomposing, burning, changing, forming, producing, acid weathering, rusting, oxidizing More words to look for:

Day 3: Notes - ID the word(s) indicating a chemical change is taking place in each of the following phrases. Record the words under the chemical changes flap after “more words to look for”.  A silver bracelet tarnishes.  A bicycle is left out in the rain and begins to rust.  Leaves on an oak tree turn red as winter approaches . Starches and sugars being broken down during energy production  Water and carbon dioxide being converted to glucose  Iron in rock combining with oxygen to form hematite Acid rain damaging marble Tarnishes Rust Turn red (color change) Broken down Converted Combining, to form (something new) Acid rain damaging (hint: if acid is involved, it’s a chemical change)

Question (hint: look for the words indicating type of change) Which of the following is an example of a chemical change? a. Ice cracking b. Sugar dissolving c. Milk souring d. Lead melting Answer: C

Question (hint: look for the words indicating type of change) Which of these describes a pollution-producing process that involves a chemical change? a. Coal with a high sulfur content is burned, producing gases that cause acid rain. b. Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen. c. Nitrogen oxide emissions combine with water vapor, producing nitric acid. d. All of the above

Question (hint: look for the words indicating type of change) Which of these changes in rocks is NOT a chemical change? a. Acid rain damaging marble b. Carbonic acid weathering limestone c. Iron in rock combining with oxygen to form hematite d. An ice wedge shattering a slab of shale Answer: D